PHY-01 The Arctic Ocean: Physics, climate & ecosystem
Numerical simulation of the Canada Basin planetary boundary layer reaction to the sea ice of varying underlying surface conditions with the Polar Weather Research and Forecasting model
Xian Jiang* , College of Oceanography, Hohai university
Xuezhi Bai, College of Oceanography, Hohai university
Haoyan Liu, College of Oceanography, Hohai university
Houshuo Jiang, Applied Ocean Physics & Engineering, Woods Hole Oceanographic Institution

A Polar Weather Research and Forecasting (Polar WRF) model has been created to better represent the air-ice(air-sea) interaction. This study investigates the performance of Polar WRF during a strong cyclone event from August 25 to September 04, 2018, over the Canadian Basin, which is characterized by a synoptic cyclone traversing the Central Arctic and the northern portion of the Beaufort, Chukchi, and East-Siberian Seas, and a 4-day-long embodied mesoscale cyclone over the Central Arctic. The 4-km resolution Polar WRF simulation closely reproduces the cyclone's development, and the simulated near-surface conditions are consistent with the station, sounding site, and satellite data. Polar WRF model simulations evaluated the vertical inversion of temperature, humidity, and low-level jet stream at various horizontal and vertical resolutions with varying subsurface conditions (with and without sea ice cover).The fluctuation of temperature and humidity in the lower atmosphere (both near the surface and in the atmospheric boundary layer) was examined under the cyclone system for several species of subsurface sea ice. The special front due to low temperature near the surface impacts in the MIZ is also examined. Experiments by CNTL and NO-ICE have also statistically and analytically investigated the influence of various subsurface sea ice covers on the height of the Arctic air boundary layer. In addition, the CNTL simulations compare the surface energy budget for various species of subsurface sea ice in order to get physical insight into the potential effects of various species of sea ice cover on changes in the lower-level atmosphere. Finally, a conceptual model for this particular front on the lower-level atmosphere is proposed.